From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 9 Jul 2007 16:51:58 +0000 (+0200)
Subject: sched: increase the resolution of smpnice
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9aa7b369819940cb1f3c74ba210516739a32ad95;p=linux-beck.git

sched: increase the resolution of smpnice

increase SMP-nice's resolution. This is needed by CFS to
implement SCHED_IDLE and cleaned up nice level support.

no behavioral changes.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 61a111fe2b7a..d5084e7c48cf 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -652,7 +652,14 @@ enum cpu_idle_type {
 /*
  * sched-domains (multiprocessor balancing) declarations:
  */
-#define SCHED_LOAD_SCALE	128UL	/* increase resolution of load */
+
+/*
+ * Increase resolution of nice-level calculations:
+ */
+#define SCHED_LOAD_SHIFT	10
+#define SCHED_LOAD_SCALE	(1L << SCHED_LOAD_SHIFT)
+
+#define SCHED_LOAD_SCALE_FUZZ	(SCHED_LOAD_SCALE >> 5)
 
 #ifdef CONFIG_SMP
 #define SD_LOAD_BALANCE		1	/* Do load balancing on this domain. */